Capital Gains Tax Estimator Use this calculator to estimate your capital gains tax. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content How Will Working Affect Social Security Benefits? Knowing the rules may help you decide when to start benefits. The Long Run: Women and Retirement For women, retirement strategy is a long race. It’s helpful to know the route. Deciding When to Take Social Security One of the most common questions people ask about Social Security is when they should start taking benefits.